The design of that case was intended for use with systems of the era in which is was created. It was not designed to be used with a 9900k, or any modern system really. Back then, there was far less NEED for airflow over components and through the heatsink like there is today. The TDP of processors was much lower and could be managed without actively exchanging as much ambient vs internal air as there is now.
With that design, with the two 92mm fans as intake and the air path going straight on out the top through the two 120mm fans, not only is it not going to do anything at all for the CPU cooler, it's not doing a thing for the rest of the hardware such as the southbridge, memory, graphics card, etc. That airpath might as well not exist at all except for some residual cooling over the VRMs.
I certainly understand your attachment to a case you've had a long time, and prefer, but sometimes when you want "X" (With X being a high TDP platform and big graphics card) you need to do "Y", whether you like it or not. In this case, without flipping those 92mm fans around as exhaust in addition to the top fans being exhaust, and putting some intake fans into the bottom or front of the case, I just don't see it being realistic. I could be wrong, but I really doubt it. Even people with cases specifically designed for intentionally great airflow through the case tend to, in some situations, have difficulty managing thermals on this platform with that or similar high TDP processors. Keep in mind, there is more than JUST the CPU thermals to worry about. VRM throttling, graphics card temperatures, southbridge, memory, these are all things that could be affected by the obvious lack of airflow THROUGH the case, in addition to the CPU cooler itself.
With the design of that case, regardless of which way you turned the CPU heatsink (And there is really only ONE way to correctly install it, which is normally a front to back and out the rear exhaust airpath, if you don't want to be using heat from the graphics card to try and cool the heatsink) I can't see any way of getting fresh air INTO the heatsink when it's going directly from those back (And THAT is a ridiculous design, even for an older tower) fans straight out through the top.
Perhaps, if you have your heart TRULY set on keeping this case, and don't feel up to the task of doing the modifications yourself, you could contract somebody to do it for you. There are a good many places that do mods professionally around the country, and the world really. If I lived close enough to you, heck, I'd do it for you.
Another option might be to completely block off the mesh on the opposite side of those bottom intake fans in the lower compartment, and open up the path from bottom to top compartment a little bit, and then flip those 92mm fans around so you have four exhaust fans in the top and rear and at least two (Maybe even add another if possible to the bottom) intake fans in the bottom. It wouldn't be perfect, but it would be BETTER anyhow.
If you simply want a big case with good airflow and decent quality that isn't terribly expensive, the Corsair 750D might be a good choice. It's not flashy. It's pretty basic and it's only 100 bucks.
PCPartPicker Part List
Case: Corsair - 750D ATX Full Tower Case ($109.99 @ Newegg)
Total: $109.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-05-20 13:19 EDT-0400
These might also be options.
The Lian Li PC-011 Dynamic.
https://www.neweggbusiness.com/Prod...SID=&cjevent=1c4b71497b2411e9824700060a1c0e0c
The Fractal Define R6 is an amazing case.
Phanteks Enthoo Luxe is very nice, and loaded with features as is the Enthoo Primo and Enthoo Primo aluminum.
There are many others out there as well. I do like you case, but not as is. It would require some significant modifications, in my opinion, to make it realistic for use with the hardware you have planned to go with.